This paper introduces an alternative approach of how to build the institutional repository, the multi-platform IR, for research institutes whose internal research units have existing IRs. Firstly, it describes the strategy of IR that harvests data from existing various-platform local repositories, allows researchers to manually input their publication data, provides administrative tool to manipulate the IR database, and includes output interface and search tool for end user. Then the program based on Drupal framework using real data from libraries of Khon Kaen University is provided to demonstrate the investigated strategy. The program perfectly performs all required tasks and could potentially be an example for future IRs of research institutes who would like to consolidate and aggregate existing local IRs.